From “Serious Games Summit,” Borut Pfeifer:

“The Unconcerned”– a game about trying to find your daughter, who is lost in the post-election riots in Tehran.

Ideas:

Consider the conceptual axes of your prototype: mechanics, rules, and aesthetics
Use a thematic statement, in which you clarify what your goals are.
Metaphor mechanics fail when they are too simple, overgeneralized, mismatched (conveys additional content you don’t want), or when they’re too repetitive.